Calculate Circle Perimeter: Given Radius = 4 Units

To solve this problem, we will determine the circumference of the circle:

• Step 1: Identify the radius, $r$. From the diagram, the number $4$ is provided, suggesting that $r = 4$ cm.
• Step 2: Use the circumference formula for a circle: $C = 2\pi r$.
• Step 3: Substitute the radius into the formula: $C = 2\pi \times 4 = 8\pi$ cm.

Therefore, the circumference of the circle is $8\pi$ cm. This aligns with choice 3 from the provided options.

The correct and verified circumference is $8\pi$ cm.